So my next question would be do male rats really have nipples then? I had read a few times that they didn't so that is what I looked for when picking out females and holding them up to what most likely was litter mates and choosing the ones where everything was closer. I hope I get better with sexing them the longer I have them, since I still need a few more females to meet the demands. I did pick up a red full hooded hopefully girl today, I checked and the guy at the store checked also so hopefully the odds are good lol.